Added tests for embedding demonstration

[SVN r16409]

test/embedding.cpp

@@ -0,0 +1,112 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+
+// embedded_hello -- A simple Boost.Python embedding example -- by
+// Dirk Gerrits
+
+#include <iostream>
+#include <boost/python.hpp>
+#include <boost/scoped_ptr.hpp>
+
+namespace python = boost::python;
+
+// An abstract base class
+class Base : public boost::noncopyable
+{
+public:
+    virtual ~Base() {};
+
+    virtual std::string hello() = 0;
+};
+
+// C++ derived class
+class CppDerived : public Base
+{
+public:
+    virtual ~CppDerived() {}
+    
+    std::string hello()
+    {
+        return "Hello from C++!";
+    }
+};
+
+// Familiar Boost.Python wrapper class for Base
+struct BaseWrap : public Base
+{
+    BaseWrap(PyObject* self_)
+        : self(self_) {}
+
+    std::string hello() { return python::call_method<std::string>(self, "hello"); }
+
+    PyObject* self;
+};
+
+// Pack the Base class wrapper into a module
+BOOST_PYTHON_MODULE(embedded_hello)
+{
+    python::class_<Base, BaseWrap, boost::noncopyable>("Base")
+        ;
+
+}
+
+
+void test()
+{
+//- INITIALIZATION -----------------------------------------------------------//
+
+    // Register the module with the interpreter
+    PyImport_AppendInittab("embedded_hello", initembedded_hello);
+
+    // Initialize the interpreter
+    Py_Initialize();
+
+    // Load the module
+    PyObject* main_module    = PyImport_AddModule("__main__");
+    PyObject* main_namespace = PyModule_GetDict(main_module);
+    Py_INCREF(main_namespace);
+
+    // Define the derived class in Python.
+    // (You'll normally want to put this in a .py file.)
+    PyObject* result = PyRun_String(
+        "from embedded_hello import *        \n"
+        "class PythonDerived(Base):          \n"
+        "    def hello(self):                \n"
+        "        return 'Hello from Python!' \n", 
+        Py_file_input, main_namespace, main_namespace);
+    Py_XDECREF(result);
+
+    // Extract the raw Python object representing the just defined derived class
+    python::handle<PyObject> class_ptr(PyRun_String("PythonDerived\n", Py_eval_input, 
+                                                    main_namespace, main_namespace));
+
+    // Wrap the raw Python object in a Boost.Python object using a handle
+    python::object PythonDerived(class_ptr);
+
+//- MAIN PROGRAM -------------------------------------------------------------//
+
+    // Creating and using instances of the C++ class is as easy as always.
+    CppDerived cpp;
+    std::cout << cpp.hello() << std::endl;
+
+    // But now creating and using instances of the Python class is just
+    // as easy!
+    python::object py_base = PythonDerived();
+    Base& py = python::extract<Base&>(py_base)();
+    std::cout << py.hello() << std::endl;
+}
+
+int main()
+{
+    if (python::handle_exception(test))
+    {
+        if (PyErr_Occurred())
+            PyErr_Print();
+        return 1;
+    }
+    return 0;
+}
+#include "module_tail.cpp"